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G. E. CHDBU.

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APPLICATION FILED AUG.24| 1917.

Patnted June 24, 1919.

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l eusrnvn nimma emanan, or PARIS, manca l i two' parts, one of Specification of Letters Patent.

Application led August 24, 1917. Serial No. V188,024.5.

To all whom t may concern;

'Be it known that I, GUsTAvE EMILE Crixi- DRU, citizen of the French Republic, residing at Paris, France, have invented certain lnew and useful Improvements in Pistons, of

which the following is a specification.

This invention relates to pistons for motors in which the piston is provided with a valve, particularly to those pistons for charging pumps for two-stroke exploslonenglnes.

The invention comprises a piston made in which forms lthe piston proper and comprises around its periphery I an annulargroove connected `@duits to its operative face,l and the other one is constituted by a ring mounted in the said gitu` inal section that'is to say, "z ing pump is constituted 'by bill ' drawback that the intoth lthe interior of i munication between-the interior of the by suitable conofwhiich forms a valve and Iannular groove and is of less height than the latter. y

In combination with this main arrangement, the invention comprises other features pointed out in the claims.

The invention will from the fol-lowing description and accompanying drawing, given byway of example.

Figure l shows par-tial axial vertical section of a two-stroke explosion engine with charging pump. Fig."2 shows in plan the valve ofthe said pumps and: l i

4Fi 3 shows the said valve in partiallonon the line 3-3 of Fig. 2. The invention is shown as applied to a pump of the kind forming the subject of the U. s. racimo. 1,219,983 of March 2o, 1917, an engine in which the chargan annular body a. surrounding'the cylinder of the engine along a portion of its' length, a'V piston Ac independent of the.piston-,a7 .of the engine, a port e establishing communication between the pump andthe interior of the engine cylinder, the said port being provided as near as possible tothe cover of the pump body, and a port f establishing'eommunicatio'n between the source and the interior of the pump, the said yport being uncovered by the pump piston after it has traveled apart of its suction stroke.

According -to the present invention the combustion gases filter e pump body through thepiston when the "latter, in traveling its suction stroke, has not yet uncovered vthe poort establishing comk be clearly understood.;

of fresh gas.

.cylinder o and the source of fresh gas, follows: An annular piston c is re in the wall of which is provided, operative face co, an annular groove c1 of rectang-111er cross-section, which one or more con-duits 01 piston, to the body of the the latter.

The annular groove 01 `tinued downward by a groove c2 where 1t There is also provided` a ring g of diameter equal to the inside. diam mounted, and of c1. The piston c into the cylinder been provided with the 1n which the piston less height than thus formed, is

Patented June 24,1919.

medied, as

.is constructed,

near to its is connected by provided in the operative face of groove o1. an outside eter of the c is to be the groove introduced o of the pump, after having necessary rings.

Thus a piston c is obtained, provided with an annular automatically 1n ,Which, during the suction st 1 ton, will :be brought by its well as :by the depression p of the cylinder, edge of before the piston On the contrary, stroke, the valve g, as well as tothe pr its riction against forced against groove c1, so that,

has passed beyon ment of one of other.- For this made of U-shape parallel branches of the slightly smaller l annular groove c1. two ends of the said inserted, 'between U, a lining i of a tance between the erably moreover from falling out free branches of suction andl by its friction a the groove c1 the groove c2 to the therefrom that admi place as soon as the posite the admission p preferaibl to bear against conduits 01.

has

the wall of th the lower ed d the lower edge ova-ble valve g roke of the pismomentum, as reduced by the gainst the wall the upper so that it will connect It follows ssion will be able to take groove c2 arrives ort, that is to say, uncovered the said port. during the compression `owing to its momentum, essure of the gases and to oplong e cylinder, ge of the `assoon as its upper edge of the port the latter and pump, is cut 01T.

y so arranged that the 1noveits ends relatively to the reason, the said valve is in longitudinal section, the

h ength than the At the point the parallel bran said branches, the said lining is by means of a pi the U are prefer aving the width of the where the valve join each other, is

ches of the height equal to the disand prefprevented n g". The ably given veating port also being a certain elasticity in order to resist to a material ext-ent Wearing out of the parts against which it rests.

The invention is not limited to the construction described, but comprises any modifications within the scope of the claims.

Having new particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. An internal combustion engine of the type described'comprising a working cylinder having a piston to reciprocate therein and also having an annular chamber surrounding a'portion thereof and forming with the latter an annular pump cylinder provided with an ingress port, a communi formed between the upper portion of said chamber and the cylinder, a piston mounted to reciprocate in said annular chamber and having a main annular groove in the upper portion thereof continued downwardly into a second annular groove of smaller depth than the main annular groove, and an automatically operating annular valve engaging the said main annular groove and having contact with the wall of the annular chamber' to control the port in the latter and communication thereof with the port'between the annular {chamber and the cylinder, the piston in the annular chamber also having one or more conduits opening into the main annular groove.

2. In an internal combustion engme olf-the type described comprising a working cylinder having a piston to reciprocate therein and also provided with an annular chamber surrounding a portion thereof and forming with the latter an annular pump cylinder, a port being formed in the w( ll of the working cylinder to provide communication between the latter and the annular chamber and the wall of the annular chamber also having a port therein in communication with a source of gas, a piston mounted to reciprocate in the annular chamber and having a plurality of ports extending through the upper portion thereof te set up communication between the ports of the cylinder and the gas charging port, the piston being provided with an upper main groove into which open the upper plurality of ports and a continuing lower shallower groove, and an automatically shift-able valve in the upper main port having a self-contracting and expanding actuation, the said valve controlling communication between the gas charging port of the pump and the plurality of ports through the upper port of the piston in the said annular chamber.

3. An internal combustion engine of the type described comprising a working cylinder having a piston to reciprocate therein and also provided with an annular chamber surrounding a portion thereof and forming with the latter an annular pump cylinder provided with a gas charging port, the working cylinder also having a port opening therefrom and adapted to communicate with the upper port of the annular chamber, and a piston mounted to reciprocate in the annular chamber and having a plurality of ports through the upper portion thereof to provide communicating means between the eas charging port and the port of the working c vlinder, the piston in the annular chamber also being provided with automatically operating means for cutting off communication between the said ports.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

' GUs'rAvE Eintr entran. [ne] Witnesses JOSEPH GEMENIE, EUGNE JULTm. 

